/Engine/Plugins/Experimental/PCG/Source/PCG/Public/Tests/Determinism/PCGDeterminismTestsCommon.h
This will expand the testing volume by an increase of this ratio - ex. 0.25 == 125%
namespace PCGDeterminismTests { namespace Defaults { static PCGDeterminismTests::Defaults::TestingVolumeExpandByFactor = 0.25; } }